The stock is always in the wrong truck. I drive an E350 with a Stahl utility box. I get 10 MPG, loaded. My van is in the shop right now getting the paint touched up, so I've been riding with the guys in an E-150, 13.8 MPG. Never enough room for the tools and materials we need. I do residential new construction, remodels and service as well as commercial remodels and service. My truck is always loaded with everything, no choice. I could never go back to a smaller van and make multiple trips because I didn't have something I needed. I might not be right but its the way I do it.